近日，中山大学蔡鑫伦团队研究了V波段超快可调谐薄膜铌酸锂傅里叶域锁模光电振荡器。该研究于2025年12月11日发表在《光：科学与应用》杂志上。

研究组首次在薄膜铌酸锂平台上实现了傅里叶域锁模光电振荡器（FDML OEO），该器件利用铌酸锂的高速泡克尔斯效应，集成了电调谐超快频率扫描滤波器。该振荡器产生了创纪录的高达65GHz的射频振荡，在偏离载波10kHz频偏处，其50GHz信号的相位噪声比高性能商用信号源低14dB以上。

通过FDML OEO成功生成了线性啁啾微波波形，其扫描带宽达到前所未有的30GHz，对应5.7GHz/μs的啁啾速率和159054的大时宽积。这些结果验证了利用薄膜铌酸锂制备集成化FDML OEO的可行性，该器件能够实现迄今其他方法无法达到的啁啾速率与频率下的超宽扫描带宽。

附：英文原文

Title: V-band ultra-fast tunable thin-film lithium niobate Fourier-domain mode-locked optoelectronic oscillator

Author: Ma, Rui, Huang, Zijun, Yao, X. Steve, Hao, Peng, Ke, Wei, Cai, Xinlun

Issue&Volume: 2025-12-11

Abstract: We demonstrate the first Fourier-domain mode-locked optoelectronic oscillator (FDML OEO) fabricated on the thin-film lithium niobate (TFLN) platform, deploying an electrically tuned ultra-fast frequency-scanning filter, thanks to the high-speed Pockels effect in TFLN. Record-breaking high radiofrequency oscillations up to 65GHz are achieved, with a phase noise more than 14dB less at 50GHz than that of a high-performance commercial signal source at an offset frequency of 10kHz away from the carrier. A linearly chirped microwave waveform with an unprecedented scanning bandwidth of 30GHz, corresponding to an impressive chirp rate of 5.7GHz/μs and a large time-bandwidth product of 159054, is successfully generated by the FDML OEO. These results validate the feasibility of utilizing TFLN to fabricate integrated FDML OEOs capable of delivering ultra-wide scanning bandwidth at chirp rates and frequencies not attainable with any other approaches to date.

DOI: 10.1038/s41377-025-01988-7

Source: https://www.nature.com/articles/s41377-025-01988-7